2. Avoid friendly fire
If you've been following along, you should see a menu showing every add-on installed in your browser of choice. Don't delete everything just yet, though, because many installed add-ons are actually pretty useful.
Instead, go through each add-on to see if it matches the toolbar you installed. When you find it, select it and click the Remove button, Disable button or trash icon, depending on the browser.
Try not to delete add-ons from Microsoft, Adobe, or any other company that you recognize.
3. Trial and error works
If you're worried about deleting the wrong thing, all add-on pages feature a "disable" button which temporarily shuts the add-on down without uninstalling it. You can re-enable it later if you find it's something you need.
Practice a little trial and error by disabling and re-enabling add-ons that look suspicious until your unwanted toolbar is gone. After you've identified your target, hit the delete button and kiss the toolbar goodbye.